I went with the Borla (Mopar) cat back system. (I figured someone at Borla was asked to design and supply these for our trucks). At the time I purchased the system, Mopar had a part number for them, and were backed by the original warranty, since I also had the dealer install the system. (I still have the original receipt). What I like most about the Borla, is the ability for the system to remain "quiet" if you carefully feed the boot into the pedal. These are times when one wishes to be a little less obvious.
Otherwise, when your "on the pipe" they are full, smooth, and deep with no popping or metallic sound.